Fused Polycyclic Emission Layers for Efficient, Stable OLEDs

Solution Overview

Problem

Existing organic electroluminescence display devices face challenges in achieving high light efficiency and stability in light emitting elements.

Innovation Solution

Incorporation of a fused polycyclic compound represented by specific chemical formulas in the emission layer of light emitting elements, enhancing luminous efficiency and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic electroluminescence materials are used in light emitting elements, then device structure can be maintained simple, but luminous efficiency and stability are insufficient

Engineering Contradiction:

ImprovestabilityVSAvoidemission layer composition

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The emission layer employs a composite material system comprising a host compound and a guest compound (fused polycyclic compound). This composite approach allows the host to provide structural framework and stability while the guest compound enhances luminous efficiency through its unique molecular structure and photophysical properties, thereby improving overall device performance without excessive complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes compounds with specific molecular parameters (such as HOMO-LUMO energy levels, triplet energy levels, and molecular weights) to optimize performance. By carefully selecting compounds with appropriate parameter ranges, the emission layer achieves high luminous efficiency and stability while maintaining manageable compositional complexity.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If conventional light emitting materials are used, then manufacturing process can be kept simple, but luminous efficiency is low

Engineering Contradiction:

Improveluminous efficiencyVSAvoidemission layer fabrication

Core Design Contradiction:

Use of energy by moving objectVSEase of manufacture

Solution Approach 1:

The patent optimizes luminous efficiency by adjusting key parameters of the emission layer including host-to-guest concentration ratios, molecular weight ranges, and energy level alignments. These parameter optimizations enable high efficiency while maintaining compatibility with standard vacuum deposition or solution processing manufacturing techniques.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The host compound acts as an intermediary that facilitates efficient energy transfer to the guest compound. This intermediary role allows the system to achieve high luminous efficiency through effective triplet exciton utilization while maintaining relatively simple manufacturing processes, as the host-guest interaction naturally mediates the energy conversion mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If existing emission layer materials are used, then fabrication process can be maintained simple, but stability and luminous efficiency cannot be simultaneously achieved

Engineering Contradiction:

ImprovestabilityVSAvoidluminous efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The emission layer employs a composite material system comprising a host compound and a guest compound (fused polycyclic compound). This composite approach allows the host to provide structural framework and stability while the guest compound enhances luminous efficiency through its unique molecular structure and photophysical properties, thereby improving overall device performance without excessive complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes compounds with specific molecular parameters (such as HOMO-LUMO energy levels, triplet energy levels, and molecular weights) to optimize performance. By carefully selecting compounds with appropriate parameter ranges, the emission layer achieves high luminous efficiency and stability while maintaining manageable compositional complexity.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Improves the luminous efficiency and stability of light emitting elements, leading to enhanced performance in display devices.

Implementation Method 1

An organic electroluminescence display device or the like is a display device that includes a self-luminescence light emitting element that displays images by recombining holes and electrons injected separately from a first electrode and a second electrode within an emission layer. This recombination causes a light emitting material in the emission layer to emits light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250338772A1Light emitting element, fused polycyclic compound for the light emitting element, and display device including the light emitting element

Publication Date: 2025.10.30 SAMSUNG DISPLAY CO LTD

AI summary

A light emitting element includes a first electrode, a second electrode arranged on the first electrode, and an emission layer arranged between the first electrode and the second electrode and including a first compound represented by Formula 1.